Downloaded twice, wont restore archive.

Hello.

I have downloaded this game twice.

One it automatically installed to an area i didnt want, so i uninstalled and it deleted the game.

So i downloaded again and to archive.

Once downloaded i copied the file to my External HDD.

And i clicked install on impulse, but it started to download, so remembering my ARchived version I went to restore archive and it is unable to.

Any help would be great

the file is Demigod1.00.070_05.05.2009.impulse

can i install some other way?